Words given on the left side of (::) are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation.

Den : Lion :: Web :?

Spider

Den : Lion :: Web :?

The logic followed here is :

A place where a lion lives is known as Den

Similarly

A place where a spider lives in known as Web